Electric switch



(No Model.) 2 Sheets-Sheet 1.

L. DAFT.

ELECTRIC SWITCH. No. 320,630. Patented June 23, 1885.

[glare .Fqure N. PETERi Pholoijlholnphar, Wilhlngion, ILC.

(N0 Modl.) 2 SheetsSl 1eet 2. L. DAFT.

ELECTRIC SWITCH.

No. 320,630.. Patented June 23, 1885.

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N, PETERS, Phclo-Lflhognpher. Walhingion. D C.

UNETF. STATES LEO DAFT, OF GREENVILLE, NEWV JERSEY.

ELECTRIC SWITCH.

QEL-ACIFICATEOW forming part i Letters Patent No. 320,630, dated June 23, 1885.

Application filed August 12, 1882. (No model.)

2" 0 aZZ whom it may concern:

Be it known that I, LEO DAFT, of Green ville, New Jersey, have invented a new and useful Improvement in Switches, of which the following is a full, true, and exact description, reference being had to the accompanying drawings.

My switch is particularly applicable to the control of electromotors, and is designed by a simple mechanism to cause such motors to operate in either direction, and also to regulate their speed. The direction of the motion of the motor is determined by the inter-relation of the armature poles and the field-magnet con nections. By reversing the connection of the brushes with the field-magnet connections a reversal in motion will occur. The regulation of speed is occasioned by throwing a resistance or resistances into circuit.

My invention will be readily understood from the accompanying drawings, in which Figure 1 represents a front View of my switch, the upper part being broken away to show the construction of the switch-cylinder; Fig. 2, a section through the casing of Fig. 1, showing a top or plan View of the switch-cylinder; Fig. 3, a view of the connections, and Fig. 4 a view of the rheostats which are to be introduced in the circuit when it is desired to slow the motor. Fig. represents a general view of the switch-connections in combination with longitudinal conductors or tracks or other source of electricity, the motor, and the controllingswitch.

A represents a cylinder, which is preferably of insulating material. The plates which are upon it should at any rate be insulated from each other. This cylinder has upon its surface four plates, the shapes of which are shown in Fig. 2.

O and O are substantially rectangular plates before they are shaped to the cylinder, while triangles are cut out of the adjacent sides of the rectangular plates B B.

Upon both sides of the cylinder-springs 1, 2, 3, 4, 5, and 6 are arranged, adapted to make connection with these plates. The springs shown in Fig. 2, and bearing similar numbers,

are connected together, and these connected springs are connected with the brushes and fieldmagnet wires in the manner shown in Fig. 5-that is, each connection shown in Fig. 5 corresponds to the spring of the same number in Fig. 2. Plus and minus represent the connections by which the battery-current passes to the motor. Springs 1 are supposed to be connected to one pole of the battery or generator,while the field-magnet coil marked plus is connected to the other. The brushes 2 and 3 are respectively connected to the springs 2 and 3,(shown in Fig. 2,) and the end of the coil of the field-magnet marked 4 is connected to the springs marked 4.

Two rheostats, R R,(shown in Figs. 4 and 5,) are connected by the connections 4 5 6 with the springs 4 5 6. (Shown in Fig. 2.)

The cylinder can be swung to the right or left by means of the handle H. K K K are index-plates showing the position ofthe switch cylinder.

The operation of my apparatus can now be readily understood. Supposing the handle H to be swung to the left over the first plate, K, the springs 1 and 2 on the right of Fig. 2 will bear against the plate G,while the springs 3, 4, 5, and 6 will bear against the plate B. The current will then flow through spring 1, plate 0, spring 2, to brush 2 in Figs. 3 and 5, from brush 2 to spring 3, and thence by plate 13 to spring 4, to field'magnet connection 4 in Figs. 3 and 5,'thenee returning by the connection plus to the source of the electricity. By advancing the lever still farther to the left spring 4 will be disconnected from plate B, and therefore the current will pass by spring 5 to connection 5 of the rheostat, Figs. 4 and 5, thence from the other side of the rheostat to the connection 4 in Figs. 3 and 5, previously described. A still greater motion will bring in the rheostat R, thereby increasing the re sistance in the circuit. By moving the handle H to the right the springs on the left of the apparatus are caused to bear on the plates B and O. The connection will then be from spring 1 by the plate 0 to spring 3, thence to brush 3, thence to brush 2 by spring 2, to plate B, to spring 4, to connection 4, (shown in Fig. 3,) thence returning to the source of electricity. It will be observed that the brushes 2 and 3 have by this movement been reversed in their relation to the field-magnet connections. By a still farther movement of the lever H to the ICO right resistances will be thrown in in the same manner as when it was moved to the left.

lVhat I claim as my invention, and desire to secure by Letters Patent, is

1. A switch for electric motors,which consists of a cylinder or cylindrical surface having upon it four connecting-plates, two of which serve to reverse connections and the other two of which serve to vary the resistance of the circuit controlled by them, and the connections shown for enabling said operations to be accomplished, substantially as decribed.

2. The combination of an electric motor and a switch and connections, substantially as described, consisting of a connection from each of the commutator-brushes, from oneextremity of the coils surrounding the field-magnet, and from one of the poles of the generator, the other pole of the generator being connected directly to one extremity of the fieldcoil, whereby the current through the armature may be reversed without changing the direction of the current through the ficld-coils, substantially as described.

3. The combination of an electric motor, one

or more resistances, a switch, and connections, substantially as described, whereby the relation of the poles of the armature to the poles of the field-magnets may be changed and the resistance of the circuit varied.

4. An electric switch which consists of a cylinder having upon it two rectangular plates which in the operation of the switch reverse a circuit, and two other plates which present an edge at an angle to the movement ofthe switch, whereby cutting-springs bearing upon the surface of said cylinder may be successfully brought in contact with the electrical connection upon the cylinder or with the insulating material between the plates at the will of the operator, substantially as described.

5. An electric switch which consists of a cylinder of insulating material, having upon it the plates 0 G and the angular plates B 1;, presenting a conducting-surface at an angle to the motion of the cylinder, substantially as described.

LEO DAFT.

Witnesses:

G120. H. Evans, WM. A. PoLLooK. 

